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The original PS3 used a cable that looks similar to a PC power cord, like this one:
The newer "slim" PS3's use a a different plug-in that looks like this:
The two are not interchangeable. If you look at the back of your PS3, it will be obvious which one you need.
And yes, the correct power cable is the only piece of hardware you need to power a PS3.

To further add to BlueRaja's answer. The cable type required to power PS3's is of the IEC 60320 family, Specifically: C7 and C13 types, with earlier models utilising C13.
All of which are IEC standard female couplers. The only difference as Powerlord has stated, would be your region, which would require you to find the correct plug/adapter for your mains ...